CVE-2023-25930 in DB2
Summary
by MITRE • 04/28/2023
IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 10.1, 11.1, and 11.5 is vulnerable to a denial of service. Under rare conditions, setting a special register may cause the Db2 server to terminate abnormally. IBM X-Force ID: 247862.
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Analysis
by VulDB Data Team • 04/28/2023
IBM Db2 for Linux UNIX and Windows versions 10.1 11.1 and 11.5 contain a denial of service vulnerability that can be triggered by manipulating specific register values under uncommon circumstances. This vulnerability affects the Db2 server process which may terminate unexpectedly when certain special registers are set. The flaw represents a critical weakness in the database management system's error handling mechanisms and resource management protocols. The vulnerability stems from insufficient validation of register states during server operation which can lead to abrupt process termination. This issue falls under the category of improper handling of exceptional conditions as classified by CWE-703 and aligns with ATT&CK technique T1499.3 for network denial of service. The impact of this vulnerability extends beyond simple service interruption as it can affect database availability and potentially disrupt business operations depending on the criticality of the Db2 instances in use. Organizations running these specific Db2 versions face significant risk of unplanned outages that could affect data access and application functionality across their infrastructure.
The technical implementation of this vulnerability occurs when specific register states are manipulated within the Db2 server environment. These special registers control various operational aspects of the database engine and when set to particular values the system fails to properly validate these inputs. The abnormal termination typically occurs during query processing or transaction handling when the server attempts to process the modified register values. The rare conditions required to trigger this flaw suggest that it may be dependent on specific environmental factors or concurrent operations within the database system. This characteristic makes the vulnerability particularly challenging to detect and reproduce in testing environments. The vulnerability demonstrates a weakness in the server's defensive programming practices and lacks proper input sanitization for register manipulation operations. Security researchers have identified that the flaw is related to memory management and process state handling within the database engine's core components. The vulnerability could potentially be exploited by authenticated users with sufficient privileges to modify system registers or through indirect means that manipulate the underlying system state.
Operational impact of this vulnerability extends beyond immediate service disruption to include potential data integrity concerns and business continuity risks. When the Db2 server terminates abnormally it can leave transactions in inconsistent states and potentially corrupt database files if the termination occurs during critical operations. The vulnerability affects multiple versions of the Db2 platform which means organizations with heterogeneous database environments may face widespread impact across their infrastructure. Network availability can be compromised as dependent applications and services that rely on Db2 connectivity may fail or require manual intervention to recover. The intermittent nature of the triggering conditions makes it difficult for administrators to implement preventive measures or detect the vulnerability during routine monitoring. Organizations may experience unexpected downtime during peak usage periods which could result in significant financial losses and service degradation. The vulnerability also impacts system recovery procedures as administrators must manually restart services and potentially perform database integrity checks after termination events. This disruption can cascade through dependent systems that rely on continuous database availability for their operations.
Mitigation strategies for this vulnerability should focus on immediate patching and implementation of compensating controls. IBM has released patches and fixes for this vulnerability in updated versions of Db2 that address the register validation issues and improve error handling mechanisms. Organizations should prioritize upgrading to patched versions of Db2 10.1 11.1 or 11.5 as soon as possible to eliminate the risk of exploitation. System administrators should implement monitoring solutions that can detect abnormal process termination events and alert security teams to potential exploitation attempts. Network segmentation and access controls should be reinforced to limit the ability of unauthorized users to manipulate system registers. Database administrators should review and restrict user privileges to prevent unnecessary access to register manipulation functions. Additional defensive measures include implementing process monitoring tools that can detect and automatically restart terminated Db2 services. Organizations should also conduct thorough vulnerability assessments to identify all instances running affected Db2 versions and prioritize remediation efforts based on risk exposure. Regular security audits should include verification of patch status and configuration settings to prevent exploitation of this and similar vulnerabilities. The implementation of automated patch management systems can help ensure that all database instances receive timely updates and maintain consistent security postures across the organization.